sys/compat/cloudabi/cloudabi_fd.c

   1 /*-
   2  * Copyright (c) 2015 Nuxi, https://nuxi.nl/
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23  * SUCH DAMAGE.
  24  */
  25
  26 #include <sys/cdefs.h>
  27 __FBSDID("$FreeBSD$");
  28
  29 #include <sys/param.h>
  30 #include <sys/capsicum.h>
  31 #include <sys/filedesc.h>
  32 #include <sys/proc.h>
  33 #include <sys/mman.h>
  34 #include <sys/socketvar.h>
  35 #include <sys/syscallsubr.h>
  36 #include <sys/sysproto.h>
  37 #include <sys/systm.h>
  38 #include <sys/unistd.h>
  39 #include <sys/vnode.h>
  40
  41 #include <contrib/cloudabi/cloudabi_types_common.h>
  42
  43 #include <compat/cloudabi/cloudabi_proto.h>
  44 #include <compat/cloudabi/cloudabi_util.h>
  45
  46 /* Translation between CloudABI and Capsicum rights. */
  47 #define RIGHTS_MAPPINGS \
  48         MAPPING(CLOUDABI_RIGHT_FD_DATASYNC, CAP_FSYNC)                  \
  49         MAPPING(CLOUDABI_RIGHT_FD_READ, CAP_READ)                       \
  50         MAPPING(CLOUDABI_RIGHT_FD_SEEK, CAP_SEEK)                       \
  51         MAPPING(CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS, CAP_FCNTL)            \
  52         MAPPING(CLOUDABI_RIGHT_FD_SYNC, CAP_FSYNC)                      \
  53         MAPPING(CLOUDABI_RIGHT_FD_TELL, CAP_SEEK_TELL)                  \
  54         MAPPING(CLOUDABI_RIGHT_FD_WRITE, CAP_WRITE)                     \
  55         MAPPING(CLOUDABI_RIGHT_FILE_ADVISE)                             \
  56         MAPPING(CLOUDABI_RIGHT_FILE_ALLOCATE, CAP_WRITE)                \
  57         MAPPING(CLOUDABI_RIGHT_FILE_CREATE_DIRECTORY, CAP_MKDIRAT)      \
  58         MAPPING(CLOUDABI_RIGHT_FILE_CREATE_FILE, CAP_CREATE)            \
  59         MAPPING(CLOUDABI_RIGHT_FILE_LINK_SOURCE, CAP_LINKAT_SOURCE)     \
  60         MAPPING(CLOUDABI_RIGHT_FILE_LINK_TARGET, CAP_LINKAT_TARGET)     \
  61         MAPPING(CLOUDABI_RIGHT_FILE_OPEN, CAP_LOOKUP)                   \
  62         MAPPING(CLOUDABI_RIGHT_FILE_READDIR, CAP_READ)                  \
  63         MAPPING(CLOUDABI_RIGHT_FILE_READLINK, CAP_LOOKUP)               \
  64         MAPPING(CLOUDABI_RIGHT_FILE_RENAME_SOURCE, CAP_RENAMEAT_SOURCE) \
  65         MAPPING(CLOUDABI_RIGHT_FILE_RENAME_TARGET, CAP_RENAMEAT_TARGET) \
  66         MAPPING(CLOUDABI_RIGHT_FILE_STAT_FGET, CAP_FSTAT)               \
  67         MAPPING(CLOUDABI_RIGHT_FILE_STAT_FPUT_SIZE, CAP_FTRUNCATE)      \
  68         MAPPING(CLOUDABI_RIGHT_FILE_STAT_FPUT_TIMES, CAP_FUTIMES)       \
  69         MAPPING(CLOUDABI_RIGHT_FILE_STAT_GET, CAP_FSTATAT)              \
  70         MAPPING(CLOUDABI_RIGHT_FILE_STAT_PUT_TIMES, CAP_FUTIMESAT)      \
  71         MAPPING(CLOUDABI_RIGHT_FILE_SYMLINK, CAP_SYMLINKAT)             \
  72         MAPPING(CLOUDABI_RIGHT_FILE_UNLINK, CAP_UNLINKAT)               \
  73         MAPPING(CLOUDABI_RIGHT_MEM_MAP, CAP_MMAP)                       \
  74         MAPPING(CLOUDABI_RIGHT_MEM_MAP_EXEC, CAP_MMAP_X)                \
  75         MAPPING(CLOUDABI_RIGHT_POLL_FD_READWRITE, CAP_EVENT)            \
  76         MAPPING(CLOUDABI_RIGHT_POLL_PROC_TERMINATE, CAP_EVENT)          \
  77         MAPPING(CLOUDABI_RIGHT_PROC_EXEC, CAP_FEXECVE)                  \
  78         MAPPING(CLOUDABI_RIGHT_SOCK_SHUTDOWN, CAP_SHUTDOWN)             \
  79
  80 int
  81 cloudabi_sys_fd_close(struct thread *td, struct cloudabi_sys_fd_close_args *uap)
  82 {
  83
  84         return (kern_close(td, uap->fd));
  85 }
  86
  87 int
  88 cloudabi_sys_fd_create1(struct thread *td,
  89     struct cloudabi_sys_fd_create1_args *uap)
  90 {
  91         struct filecaps fcaps = {};
  92
  93         switch (uap->type) {
  94         case CLOUDABI_FILETYPE_SHARED_MEMORY:
  95                 cap_rights_init(&fcaps.fc_rights, CAP_FSTAT, CAP_FTRUNCATE,
  96                     CAP_MMAP_RWX);
  97                 return (kern_shm_open(td, SHM_ANON, O_RDWR | O_CLOEXEC, 0,
  98                     &fcaps));
  99         default:
 100                 return (EINVAL);
 101         }
 102 }
 103
 104 int
 105 cloudabi_sys_fd_create2(struct thread *td,
 106     struct cloudabi_sys_fd_create2_args *uap)
 107 {
 108         int fds[2];
 109         int error, type;
 110
 111         switch (uap->type) {
 112         case CLOUDABI_FILETYPE_SOCKET_DGRAM:
 113                 type = SOCK_DGRAM;
 114                 break;
 115         case CLOUDABI_FILETYPE_SOCKET_STREAM:
 116                 type = SOCK_STREAM;
 117                 break;
 118         default:
 119                 return (EINVAL);
 120         }
 121
 122         error = kern_socketpair(td, AF_UNIX, type, 0, fds);
 123         if (error == 0) {
 124                 td->td_retval[0] = fds[0];
 125                 td->td_retval[1] = fds[1];
 126         }
 127         return (0);
 128 }
 129
 130 int
 131 cloudabi_sys_fd_datasync(struct thread *td,
 132     struct cloudabi_sys_fd_datasync_args *uap)
 133 {
 134
 135         return (kern_fsync(td, uap->fd, false));
 136 }
 137
 138 int
 139 cloudabi_sys_fd_dup(struct thread *td, struct cloudabi_sys_fd_dup_args *uap)
 140 {
 141
 142         return (kern_dup(td, FDDUP_NORMAL, 0, uap->from, 0));
 143 }
 144
 145 int
 146 cloudabi_sys_fd_replace(struct thread *td,
 147     struct cloudabi_sys_fd_replace_args *uap)
 148 {
 149         int error;
 150
 151         /*
 152          * CloudABI's equivalent to dup2(). CloudABI processes should
 153          * not depend on hardcoded file descriptor layouts, but simply
 154          * use the file descriptor numbers that are allocated by the
 155          * kernel. Duplicating file descriptors to arbitrary numbers
 156          * should not be done.
 157          *
 158          * Invoke kern_dup() with FDDUP_MUSTREPLACE, so that we return
 159          * EBADF when duplicating to a nonexistent file descriptor. Also
 160          * clear the return value, as this system call yields no return
 161          * value.
 162          */
 163         error = kern_dup(td, FDDUP_MUSTREPLACE, 0, uap->from, uap->to);
 164         td->td_retval[0] = 0;
 165         return (error);
 166 }
 167
 168 int
 169 cloudabi_sys_fd_seek(struct thread *td, struct cloudabi_sys_fd_seek_args *uap)
 170 {
 171         int whence;
 172
 173         switch (uap->whence) {
 174         case CLOUDABI_WHENCE_CUR:
 175                 whence = SEEK_CUR;
 176                 break;
 177         case CLOUDABI_WHENCE_END:
 178                 whence = SEEK_END;
 179                 break;
 180         case CLOUDABI_WHENCE_SET:
 181                 whence = SEEK_SET;
 182                 break;
 183         default:
 184                 return (EINVAL);
 185         }
 186
 187         return (kern_lseek(td, uap->fd, uap->offset, whence));
 188 }
 189
 190 /* Converts a file descriptor to a CloudABI file descriptor type. */
 191 cloudabi_filetype_t
 192 cloudabi_convert_filetype(const struct file *fp)
 193 {
 194         struct socket *so;
 195         struct vnode *vp;
 196
 197         switch (fp->f_type) {
 198         case DTYPE_FIFO:
 199                 return (CLOUDABI_FILETYPE_SOCKET_STREAM);
 200         case DTYPE_PIPE:
 201                 return (CLOUDABI_FILETYPE_SOCKET_STREAM);
 202         case DTYPE_PROCDESC:
 203                 return (CLOUDABI_FILETYPE_PROCESS);
 204         case DTYPE_SHM:
 205                 return (CLOUDABI_FILETYPE_SHARED_MEMORY);
 206         case DTYPE_SOCKET:
 207                 so = fp->f_data;
 208                 switch (so->so_type) {
 209                 case SOCK_DGRAM:
 210                         return (CLOUDABI_FILETYPE_SOCKET_DGRAM);
 211                 case SOCK_STREAM:
 212                         return (CLOUDABI_FILETYPE_SOCKET_STREAM);
 213                 default:
 214                         return (CLOUDABI_FILETYPE_UNKNOWN);
 215                 }
 216         case DTYPE_VNODE:
 217                 vp = fp->f_vnode;
 218                 switch (vp->v_type) {
 219                 case VBLK:
 220                         return (CLOUDABI_FILETYPE_BLOCK_DEVICE);
 221                 case VCHR:
 222                         return (CLOUDABI_FILETYPE_CHARACTER_DEVICE);
 223                 case VDIR:
 224                         return (CLOUDABI_FILETYPE_DIRECTORY);
 225                 case VFIFO:
 226                         return (CLOUDABI_FILETYPE_SOCKET_STREAM);
 227                 case VLNK:
 228                         return (CLOUDABI_FILETYPE_SYMBOLIC_LINK);
 229                 case VREG:
 230                         return (CLOUDABI_FILETYPE_REGULAR_FILE);
 231                 case VSOCK:
 232                         return (CLOUDABI_FILETYPE_SOCKET_STREAM);
 233                 default:
 234                         return (CLOUDABI_FILETYPE_UNKNOWN);
 235                 }
 236         default:
 237                 return (CLOUDABI_FILETYPE_UNKNOWN);
 238         }
 239 }
 240
 241 /* Removes rights that conflict with the file descriptor type. */
 242 void
 243 cloudabi_remove_conflicting_rights(cloudabi_filetype_t filetype,
 244     cloudabi_rights_t *base, cloudabi_rights_t *inheriting)
 245 {
 246
 247         /*
 248          * CloudABI has a small number of additional rights bits to
 249          * disambiguate between multiple purposes. Remove the bits that
 250          * don't apply to the type of the file descriptor.
 251          *
 252          * As file descriptor access modes (O_ACCMODE) has been fully
 253          * replaced by rights bits, CloudABI distinguishes between
 254          * rights that apply to the file descriptor itself (base) versus
 255          * rights of new file descriptors derived from them
 256          * (inheriting). The code below approximates the pair by
 257          * decomposing depending on the file descriptor type.
 258          *
 259          * We need to be somewhat accurate about which actions can
 260          * actually be performed on the file descriptor, as functions
 261          * like fcntl(fd, F_GETFL) are emulated on top of this.
 262          */
 263         switch (filetype) {
 264         case CLOUDABI_FILETYPE_DIRECTORY:
 265                 *base &= CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS |
 266                     CLOUDABI_RIGHT_FD_SYNC | CLOUDABI_RIGHT_FILE_ADVISE |
 267                     CLOUDABI_RIGHT_FILE_CREATE_DIRECTORY |
 268                     CLOUDABI_RIGHT_FILE_CREATE_FILE |
 269                     CLOUDABI_RIGHT_FILE_LINK_SOURCE |
 270                     CLOUDABI_RIGHT_FILE_LINK_TARGET |
 271                     CLOUDABI_RIGHT_FILE_OPEN |
 272                     CLOUDABI_RIGHT_FILE_READDIR |
 273                     CLOUDABI_RIGHT_FILE_READLINK |
 274                     CLOUDABI_RIGHT_FILE_RENAME_SOURCE |
 275                     CLOUDABI_RIGHT_FILE_RENAME_TARGET |
 276                     CLOUDABI_RIGHT_FILE_STAT_FGET |
 277                     CLOUDABI_RIGHT_FILE_STAT_FPUT_TIMES |
 278                     CLOUDABI_RIGHT_FILE_STAT_GET |
 279                     CLOUDABI_RIGHT_FILE_STAT_PUT_TIMES |
 280                     CLOUDABI_RIGHT_FILE_SYMLINK |
 281                     CLOUDABI_RIGHT_FILE_UNLINK |
 282                     CLOUDABI_RIGHT_POLL_FD_READWRITE;
 283                 *inheriting &= CLOUDABI_RIGHT_FD_DATASYNC |
 284                     CLOUDABI_RIGHT_FD_READ |
 285                     CLOUDABI_RIGHT_FD_SEEK |
 286                     CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS |
 287                     CLOUDABI_RIGHT_FD_SYNC |
 288                     CLOUDABI_RIGHT_FD_TELL |
 289                     CLOUDABI_RIGHT_FD_WRITE |
 290                     CLOUDABI_RIGHT_FILE_ADVISE |
 291                     CLOUDABI_RIGHT_FILE_ALLOCATE |
 292                     CLOUDABI_RIGHT_FILE_CREATE_DIRECTORY |
 293                     CLOUDABI_RIGHT_FILE_CREATE_FILE |
 294                     CLOUDABI_RIGHT_FILE_LINK_SOURCE |
 295                     CLOUDABI_RIGHT_FILE_LINK_TARGET |
 296                     CLOUDABI_RIGHT_FILE_OPEN |
 297                     CLOUDABI_RIGHT_FILE_READDIR |
 298                     CLOUDABI_RIGHT_FILE_READLINK |
 299                     CLOUDABI_RIGHT_FILE_RENAME_SOURCE |
 300                     CLOUDABI_RIGHT_FILE_RENAME_TARGET |
 301                     CLOUDABI_RIGHT_FILE_STAT_FGET |
 302                     CLOUDABI_RIGHT_FILE_STAT_FPUT_SIZE |
 303                     CLOUDABI_RIGHT_FILE_STAT_FPUT_TIMES |
 304                     CLOUDABI_RIGHT_FILE_STAT_GET |
 305                     CLOUDABI_RIGHT_FILE_STAT_PUT_TIMES |
 306                     CLOUDABI_RIGHT_FILE_SYMLINK |
 307                     CLOUDABI_RIGHT_FILE_UNLINK |
 308                     CLOUDABI_RIGHT_MEM_MAP |
 309                     CLOUDABI_RIGHT_MEM_MAP_EXEC |
 310                     CLOUDABI_RIGHT_POLL_FD_READWRITE |
 311                     CLOUDABI_RIGHT_PROC_EXEC;
 312                 break;
 313         case CLOUDABI_FILETYPE_PROCESS:
 314                 *base &= ~(CLOUDABI_RIGHT_FILE_ADVISE |
 315                     CLOUDABI_RIGHT_POLL_FD_READWRITE);
 316                 *inheriting = 0;
 317                 break;
 318         case CLOUDABI_FILETYPE_REGULAR_FILE:
 319                 *base &= CLOUDABI_RIGHT_FD_DATASYNC |
 320                     CLOUDABI_RIGHT_FD_READ |
 321                     CLOUDABI_RIGHT_FD_SEEK |
 322                     CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS |
 323                     CLOUDABI_RIGHT_FD_SYNC |
 324                     CLOUDABI_RIGHT_FD_TELL |
 325                     CLOUDABI_RIGHT_FD_WRITE |
 326                     CLOUDABI_RIGHT_FILE_ADVISE |
 327                     CLOUDABI_RIGHT_FILE_ALLOCATE |
 328                     CLOUDABI_RIGHT_FILE_STAT_FGET |
 329                     CLOUDABI_RIGHT_FILE_STAT_FPUT_SIZE |
 330                     CLOUDABI_RIGHT_FILE_STAT_FPUT_TIMES |
 331                     CLOUDABI_RIGHT_MEM_MAP |
 332                     CLOUDABI_RIGHT_MEM_MAP_EXEC |
 333                     CLOUDABI_RIGHT_POLL_FD_READWRITE |
 334                     CLOUDABI_RIGHT_PROC_EXEC;
 335                 *inheriting = 0;
 336                 break;
 337         case CLOUDABI_FILETYPE_SHARED_MEMORY:
 338                 *base &= ~(CLOUDABI_RIGHT_FD_SEEK |
 339                     CLOUDABI_RIGHT_FD_TELL |
 340                     CLOUDABI_RIGHT_FILE_ADVISE |
 341                     CLOUDABI_RIGHT_FILE_ALLOCATE |
 342                     CLOUDABI_RIGHT_FILE_READDIR);
 343                 *inheriting = 0;
 344                 break;
 345         case CLOUDABI_FILETYPE_SOCKET_DGRAM:
 346         case CLOUDABI_FILETYPE_SOCKET_STREAM:
 347                 *base &= CLOUDABI_RIGHT_FD_READ |
 348                     CLOUDABI_RIGHT_FD_STAT_PUT_FLAGS |
 349                     CLOUDABI_RIGHT_FD_WRITE |
 350                     CLOUDABI_RIGHT_FILE_STAT_FGET |
 351                     CLOUDABI_RIGHT_POLL_FD_READWRITE |
 352                     CLOUDABI_RIGHT_SOCK_SHUTDOWN;
 353                 break;
 354         default:
 355                 *inheriting = 0;
 356                 break;
 357         }
 358 }
 359
 360 /* Converts FreeBSD's Capsicum rights to CloudABI's set of rights. */
 361 static void
 362 convert_capabilities(const cap_rights_t *capabilities,
 363     cloudabi_filetype_t filetype, cloudabi_rights_t *base,
 364     cloudabi_rights_t *inheriting)
 365 {
 366         cloudabi_rights_t rights;
 367
 368         /* Convert FreeBSD bits to CloudABI bits. */
 369         rights = 0;
 370 #define MAPPING(cloudabi, ...) do {                             \
 371         if (cap_rights_is_set(capabilities, ##__VA_ARGS__))     \
 372                 rights |= (cloudabi);                           \
 373 } while (0);
 374         RIGHTS_MAPPINGS
 375 #undef MAPPING
 376
 377         *base = rights;
 378         *inheriting = rights;
 379         cloudabi_remove_conflicting_rights(filetype, base, inheriting);
 380 }
 381
 382 int
 383 cloudabi_sys_fd_stat_get(struct thread *td,
 384     struct cloudabi_sys_fd_stat_get_args *uap)
 385 {
 386         cloudabi_fdstat_t fsb = {0};
 387         struct file *fp;
 388         cap_rights_t rights;
 389         struct filecaps fcaps;
 390         int error, oflags;
 391
 392         /* Obtain file descriptor properties. */
 393         error = fget_cap(td, uap->fd, cap_rights_init(&rights), &fp,
 394             &fcaps);
 395         if (error != 0)
 396                 return (error);
 397         oflags = OFLAGS(fp->f_flag);
 398         fsb.fs_filetype = cloudabi_convert_filetype(fp);
 399         fdrop(fp, td);
 400
 401         /* Convert file descriptor flags. */
 402         if (oflags & O_APPEND)
 403                 fsb.fs_flags |= CLOUDABI_FDFLAG_APPEND;
 404         if (oflags & O_NONBLOCK)
 405                 fsb.fs_flags |= CLOUDABI_FDFLAG_NONBLOCK;
 406         if (oflags & O_SYNC)
 407                 fsb.fs_flags |= CLOUDABI_FDFLAG_SYNC;
 408
 409         /* Convert capabilities to CloudABI rights. */
 410         convert_capabilities(&fcaps.fc_rights, fsb.fs_filetype,
 411             &fsb.fs_rights_base, &fsb.fs_rights_inheriting);
 412         filecaps_free(&fcaps);
 413         return (copyout(&fsb, (void *)uap->buf, sizeof(fsb)));
 414 }
 415
 416 /* Converts CloudABI rights to a set of Capsicum capabilities. */
 417 int
 418 cloudabi_convert_rights(cloudabi_rights_t in, cap_rights_t *out)
 419 {
 420
 421         cap_rights_init(out);
 422 #define MAPPING(cloudabi, ...) do {                     \
 423         if (in & (cloudabi)) {                          \
 424                 cap_rights_set(out, ##__VA_ARGS__);     \
 425                 in &= ~(cloudabi);                      \
 426         }                                               \
 427 } while (0);
 428         RIGHTS_MAPPINGS
 429 #undef MAPPING
 430         if (in != 0)
 431                 return (ENOTCAPABLE);
 432         return (0);
 433 }
 434
 435 int
 436 cloudabi_sys_fd_stat_put(struct thread *td,
 437     struct cloudabi_sys_fd_stat_put_args *uap)
 438 {
 439         cloudabi_fdstat_t fsb;
 440         cap_rights_t rights;
 441         int error, oflags;
 442
 443         error = copyin(uap->buf, &fsb, sizeof(fsb));
 444         if (error != 0)
 445                 return (error);
 446
 447         if (uap->flags == CLOUDABI_FDSTAT_FLAGS) {
 448                 /* Convert flags. */
 449                 oflags = 0;
 450                 if (fsb.fs_flags & CLOUDABI_FDFLAG_APPEND)
 451                         oflags |= O_APPEND;
 452                 if (fsb.fs_flags & CLOUDABI_FDFLAG_NONBLOCK)
 453                         oflags |= O_NONBLOCK;
 454                 if (fsb.fs_flags & (CLOUDABI_FDFLAG_SYNC |
 455                     CLOUDABI_FDFLAG_DSYNC | CLOUDABI_FDFLAG_RSYNC))
 456                         oflags |= O_SYNC;
 457                 return (kern_fcntl(td, uap->fd, F_SETFL, oflags));
 458         } else if (uap->flags == CLOUDABI_FDSTAT_RIGHTS) {
 459                 /* Convert rights. */
 460                 error = cloudabi_convert_rights(
 461                     fsb.fs_rights_base | fsb.fs_rights_inheriting, &rights);
 462                 if (error != 0)
 463                         return (error);
 464                 return (kern_cap_rights_limit(td, uap->fd, &rights));
 465         }
 466         return (EINVAL);
 467 }
 468
 469 int
 470 cloudabi_sys_fd_sync(struct thread *td, struct cloudabi_sys_fd_sync_args *uap)
 471 {
 472
 473         return (kern_fsync(td, uap->fd, true));
 474 }